Driving to Kitt Peak in a Tesla

Driving to the top of Kitt Peak National Observatory in a rental Tesla Model S 75D from Tucson, Arizona, USA on the Highway 386 access road. This battery electric car has plenty of range for the trip, however energy consumption graphs show the vehicle using triple the energy to climb the 1,260 metre / 4,500' elevation change, and also shows the maxed-out energy regeneration on the steep drive down.